Peters



(No-Model.)

- A. JOHNSON 4Ep Gr. B. HOUGH.

DENTAL PLUGGBR.

No. 256,143. Patented Apr. 11,1882.

M 'PEYERS Pmwucmgnpher. wamingmn, DA C.

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UNITED STATES PATENT (DEEICE.

ALEEED JOHNSON AND eEEsnoM E. BOUGE, oF NEvtT GENEVA, PA.

DENTAL` PLUGGER.

SPECIFICATION forming part of Letters Patent. No. 256,143, dated April 11, 1882. Application filed February 3, 1382. (No model.)

To all whom it may concern:y

Be it known that we, ALEEED J oHNs oN and GEEsHoM B. HoUGH, of New Geneva, in the county of Fayette and State of Pennsylvania, have invented certain new-and useful Improvements in Dental Pluggers, and we do hereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in the art'to which it appertains to make and use the same, reference beinghad to the accompanyingdrawings,which form a part of this specification.

Figure 1 is a side view. Fig. 2 is a longitudinal sectional view on the line xx, Fig. l. Fig. 3 is a section on the line y y, Fig. 2; and Fig. 4 is a detail view of the tripping mechanism.

Corresponding parts in the severa-l figures are denoted by like letters of reference.

This invention relates to dental pluggers;

and it consists in certain improvements in the construction of the same, which will be hereinafter fully described, and particularly painted out in the claims.

In the drawings hereto anneXed, A represents a tubular casing, which constitutes the handle of our improved plugger,.and which is formed near its point or lower end with a lateral projection, B, forming a nger-rest.

C is the tool or point holder, which is placed in the lower end ofthe tubular casing with its point projecting, as shown. The lower or projecting end ot' the tool or point holder is provided with ascrew-threaded recess, D, in which tool-points of any description may be inserted. The tool-holder G is provided at its upper end with a shoulder, E, between which and a shoulder, F, upon the inside ot' casing A a spring, G, is adjusted, which automatically forces the tool-holder in an upward direction in the easing or handle. The upper end of the tool or point holder has a recess, H, in which is inserteda plug, I, of Wood or similar material, to deaden the stroke ot' the mallet.

Secured rigidly upon the tool or point holder C by a pin is a small wheel or disk, J, having a milled edge which projects through a transverse slot, K, in the casing A, thus enabling the tool or point holder to be readily rotated independently of handle or casing by a slight movement of the finger.

L is the lnallet or hammer, which consists of a tube, M, closed at its lower end and provided near its upper end with vertical slots N.

0 is acoiled spring placed in tube M, and

one end of which is held stationary by a pin, P, passing through the vertical slots N and through openings Q in the casing A, in which the said malletis placed just above the tool or point holder.

It will be observed that owing to the slots N the mallet or hammer may be raised in the sheath or casing, and that when-released'the spring O will force it down against the head of the tool or point holder.

To operate the mallet we avail ourselves of the mechanism which we shall now proceed to describe. y

Pivoted upon a transverse pin, R, near the upper end of the casing A, is a lever, S, one end of which projects through a slot, 'l, in the side of the casing, and is connected by a pivoted rod, U,with a slide, V, working in a dovetailed groove, W, in the side of the casing, and having a finger-piece, X, by means of which it may be conveniently operated. To the other end of lever S is pivoted a dog, Y, having an inward-projecting arm, Z, the said dog being operated by a spring secured to the under side ot' the lever S. Coiled upon the pin Itis a spring, A', provided with a loop, B', which presses against a stud, C', upon the lever S, so as to force the projecting end ofthe latter and the slide V automatically in an upward direction.

D' is an arm secured to theuppcr end ofthe mallet, and having a notch, E', to engage the dog Y.

F' is a screw-threaded cap closing the upper en d ofthe tube or casing A, and having a swiveled head, G', the lower end of which is provided with a threaded recess, H', to receive a screw, I'. Said screw is provided with `a laterally-projectng lug, J', workin g in a vertical groove, K', in the upper end of the casing A.

It will be seen thatby manipulating the swiveled head G' the screw I' may be raised or lowered in the casing.

The operation of our invention is as follows: The easing or handle is grasped by the hand, the middle linger being placed upon the rest B, and the index-finger upon the slide V,W'hich may thus be conveniently operated. By forc- IOO iM; .Y l A.

ing the slideV in a downward direction the dog Y of lever S engages the notch E' in the arm D' of the mallet, which is thus raised or forced in an upward direction until the arm Z of dog Y strikes thelower end ofscrew I',which releases the dog, thus causing the mallet to descend and deliver its blow upon the head of the tool or point holder. When the slideV is raised by the spring A' the dog Y again antomatically engages the notch E. By adjusting the screw I' the point to which the mallet may be raised, andconsequent-ly the force of the blow, is regulated.

Having thus described our invention, we claim .and desire to secure by Letters Patent ofthe United Statesl. In a dental plugger, the coi'nbnation,with the tubular casing having a transverse slot, of the tool or point holder provided with a wheel or disk havin ga milled edge projecting through said slot, so as to he capable of being rotated independently ot' handle of instrument, as set forth.

2. In a dental plugger, the herein-described mallet, consisting of a tube closed at its lower eend and inclosing a spring, and provided near its upper end with vertical slots for the passage of a pin, which also passes through the sides of the casing, as set forth.

3. The combination ofthe handle or casing, the tool or point holder, the mallet having arm D', provided with notch E', the pin R, having lever S, the dog Y, having arm Z, the connecting-rod U, and slide V, and mechanism for tripping the dog at any desired point, as set forth.

4. In a dental plugger, the coinbination,witl1 the mallet and its operating mechanism, arranged as herein described, ofthe cap F', swiveled head G', and screw I, having lug J', working in a groove in the upper end ofthe handle, as and for the purpose set forth.

In testimony that we claim the foregoing as our own we have hereto afxed our signatures in presence of two witnesses.

ALFRED JOHNSON. GERSHOM BENNETT HOUGH.

Witnesses:

F. LANGHEAD, JOHN L. JOHNSON. 

